84881428 has 6 divisors (see below), whose sum is σ = 148542506. Its totient is φ = 42440712.

The previous prime is 84881413. The next prime is 84881437. The reversal of 84881428 is 82418848.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 78641424 + 6240004 = 8868^2 + 2498^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610175 + ... + 10610182.

Almost surely, 2^84881428 is an apocalyptic number.

It is an amenable number.

84881428 is a deficient number, since it is larger than the sum of its proper divisors (63661078).

84881428 is a wasteful number, since it uses less digits than its factorization.

84881428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21220361 (or 21220359 counting only the distinct ones).

The product of its digits is 131072, while the sum is 43.

The square root of 84881428 is about 9213.1117435967. Note that the first 3 decimals coincide. The cubic root of 84881428 is about 439.4784246694.

The spelling of 84881428 in words is "eighty-four million, eight hundred eighty-one thousand, four hundred twenty-eight".